Nemotodes kill termites, though not a colony. Colonies are near impossible to eliminate. Funny. Nemotodes kill strawberry plants too. http://www.extension.umn.edu/distribution/horticulture/DG1148.html
Some symptoms can include red leaf and black root. I have a few plants with red leaves, but the leaves sit directly on the ground and are often covered by dirt during watering. Lack of nitrogen can be a culprit, however, it cannot be treated once blossoming without affecting the crop.